期刊
ELECTROCHIMICA ACTA
卷 143, 期 -, 页码 272-277出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.08.032
关键词
NaVS2; NaTiS2; Layered sulfides; Sodium intercalation; Displacement conversion reaction
资金
- Department of Energy [DE-AC02-06CH11357]
- U.S. Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
- [1,130064,01]
This study investigates the electrochemical sodium insertion/extraction of NaxVS2, and NaxTiS2 in the voltage range where either intercalation (0.2 <= x <= 1) or displacement-conversion reaction (x > 1) occurs. Both NaxVS2 and NaxTiS2 showed good reversible capacities, as high as similar to 160 mAh/g at an average voltage of similar to 1.9 V vs. Na in the region for the intercalation reaction (0.2 <= x <= 1). When sodium (Na) insertion was forced further to the x > 1 composition, NaxVS2 exhibited the direct displacement-conversion reaction at 0.3 V vs. Na without further Na intercalation, which contrasted with the wider lithium intercalation range of 0 < x <= 2 for LixVS2. The displacement-conversion reaction for NaxVS2 (x > 1) was reversible with a specific capacity of above 200 mAh/g up to 15 cycles, but the displacement reaction for NaxTiS2 (x > 1) was not observed. (C) 2014 Elsevier Ltd. All rights reserved.
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